Overview
Copper-magnesium is a solid solution alloy providing high strength with nominal reduction in conductivity relative to copper. CMg1 is one of the alloys covered by the broad CDA alloy designation C18661 for copper-magnesium. CMg1 combines high electrical conductivity with good tensile strength, excellent solderability and plateability. Applications include connectors, semiconductor pins, catenary trolley cables and conductors. There are no ASTM developed temper ranges for this alloy and the listed values are the recommendations of Fisk Alloy Wire.
Physical Properties
| Density | 0.321 lb/in³ |
| Electrical Resistivity (Annealed) | 14 Ω·cir-mil/ft @ 68 °F |
| Electrical Conductivity (Annealed) | 74% IACS @ 68 °F |
| Thermal Conductivity | 167 Btu/ft²/ft·hr/°F @ 68 °F |
| Coefficient of Thermal Expansion | 9.8 per °F (68-572 °F) |
| Modulus of Elasticity (Tension) | 18 ksi |
| Modulus of Rigidity (Tension) | 7 ksi |
| Melting Point (Solidus) | 1,700 °F |
| Melting Point (Liquidus) | 1,900 °F |
| Annealing Range (Min) | -18 °C |
| Annealing Range (Max) | -18 °C |
| Density | 8.94 gm/cm³ |
| Electrical Resistivity (Annealed) | 2.33 µΩ·cm @ 20 °C |
| Electrical Conductivity (Annealed) | 0.43 MS·cm @ 20 °C |
| Thermal Conductivity | 289 W/m·K @ 20 °C |
| Coefficient of Thermal Expansion | 17.6 per °C (20-300 °C) |
| Modulus of Elasticity (Tension) | 125 Mpa |
| Modulus of Rigidity (Tension) | 51 Mpa |
| Melting Point (Solidus) | 927 °C |
| Melting Point (Liquidus) | 1,038 °C |
Round Wire
| TEMPER NAME | TEMPER CODE | TENSILE STRENGTH (ksi) |
MILL LIMITS (inch) |
|
| Min | Max | |||
| Annealed | 35.0 | 46.0 | .0010 - .1285 inch | |
| 1/2 Hard | H02 | 55.0 | 70.0 | |
| Hard | H04 | 75.0 | 90.0 | |
| Spring | H08 | 90.0 | ||
| TEMPER NAME | TEMPER CODE | TENSILE STRENGTH (Mpa) |
MILL LIMITS (mm) |
|
| Min | Max | |||
| Annealed | 240 | 320 | .0254 - 3.264 mm | |
| 1/2 Hard | H02 | 370 | 490 | |
| Hard | H04 | 510 | 630 | |
| Spring | H08 | 620 | ||
Square Wire
| TEMPER NAME | TEMPER CODE | TENSILE STRENGTH (ksi) |
MILL LIMITS (inch) |
|
| Min | Max | |||
| Annealed | 35.0 | 46.0 | .0100 - .0808 inch | |
| 1/2 Hard | H02 | 55.0 | 70.0 | |
| Hard | H04 | 75.0 | 90.0 | |
| Spring | H08 | 90.0 | ||
| TEMPER NAME | TEMPER CODE | TENSILE STRENGTH (Mpa) |
MILL LIMITS (mm) |
|
| Min | Max | |||
| Annealed | 240 | 320 | .2540 - 1.905 mm | |
| 1/2 Hard | H02 | 370 | 490 | |
| Hard | H04 | 510 | 630 | |
| Spring | H08 | 620 | ||
